如何从JLabel图标获取ByteArray？

Question

I'm trying to get ByteArray from icon of JLabel and then store it to my database.
The reason being because when I open image in my JLabel it gets resized to 300x300 pixels, so I want to save that resized picture to my database, to keep my database lightweight.
I want to do that 'on the fly' without having to save that resized picture on the disk.

I have no problem to convert the files from the disk to a ByteArray and storing those ByteArrays in a SQLite database.
But getting the ByteArray from an icon of a JLabel is a mission impossible for me.
I don't know is it even possible.

So help me out, guys.
Is there any way to do that?

Answer 1

The JLabel is simply a placeholder for the image, you are still using the image object. Wouldn't it be easier to simply convert the image into a byte array?

File f = new File("img.jpg");
BufferedImage image = ImageIO.read(fnew);
ByteArrayOutputStream b =new ByteArrayOutputStream();
ImageIO.write(image, "jpg", b );
byte[] imageInByte = b.toByteArray();

Or if you wanted to retrieve the image from a JLabel you can use:

Icon icon = label.getIcon();
BufferedImage image = new BufferedImage(icon.getIconWidth(),
            icon.getIconHeight(),BufferedImage.TYPE_INT_RGB);